Splitting Large Files

The Slam Stick recorders are capable of producing very large files which can be difficult to post-process. It is strongly advised to "split" these larger files into more manageable sized files, we recommend 50 MB or less.

In this Article


Access IDE Splitter

To access the tool to break up large files, navigate to the Tools menu and 'Split IDE Files.' Note that the large file does not need to be opened initially to perform this split.

Split Based on Size

You can select any number of files to be broken up and also select the output directory these files should be saved to. They will be saved with the same file name as the original file and then a "_00" postfix to serialize the output files.

The recommended way to split a file is based on size. This can be entered directly by the user (specify file size) or indirectly by specifying the number of files to split a file into. Note that you can't enter both a file size and the number of files, they are mutually exclusive. This form is recommended because it ensures sequential and equal splits. In the example below, two files totaling nearly 800 MB of data were split into 17 files. This operation took less than 2 minutes.

Split Based on Time

The splitter can also be used to pull out specific time periods of interest with this same tool. The user can specify the start time and then either the end time or the duration (they are mutually exclusive). The maximum file size and number of files still apply here. For example, if the time range would create a 100 MB file, the below example would default to make several files at 16 MB.

Note

When splitting files based on time, we recommend a file size that is at least several megabytes to ensure all channels are included in the file. When trying to pull out a very small time range, some channels cannot come through because the channels aren't exactly interwoven due to varying sample rates and lengths.


Command Line Executable

There is also a command line executable for the IDE file splitter that can be downloaded here.

This utility runs from the command line (or a custom script).  To begin running the command prompt from the Start menu, search for  cmd or command prompt. The command prompt will begin in the default location, typically the Windows user directory in the C: drive. If the utility is located in another drive, change the drive by entering the drive letter followed by a colon as shown. Then change the directory by entering cd followed by the folder location as shown. Some additional basic instructions for entering and using the command line can be found here.

To fully understand the commands the executable accepts, simply enter the name of the executable followed by  - as  shown.